There are 3 terms : 7x , 4y, and 1.
a term is separated by any math symbol
examples are =, +, *
To get the that relates x and y, we choose two points on the table and use the equation of a straight line as follows:
Recall that the equation of a staight line is obtained from the formula

Using the points (30, 18) and (36, 24), we have
Answer:
20 cm2 is the answer brooooooooooo